Leaf filter system and replaceable filter leaf apparatus

ABSTRACT

A filter and replaceable filter leaf apparatus are provided. The filter includes a housing defining a cavity having fluid inlet and outlet ports and a lid member with a manifold coupled to the outlet port and being adapted to conduct a fluid flow between the outlet port and a plurality of attachment areas. Replaceable filter leafs are selectively movable through an opening into the housing cavity and attachable with the manifold at the plurality of attachment areas. The replaceable filter leafs include a filter envelope consisting of a single substantially rectangular filter panel, a nozzle member on the filter panel and defining a passageway adjacent an opening in the filter envelope for conducting fluids therethrough, and a porous grid member contained within the filter envelope. The nozzle member is selectively attachable onto the manifold of the polishing filter apparatus at one of the plurality of attachment areas. In one form, the filter envelope includes a folded rectangular filter panel with the nozzle member disposed at an outer edge thereof. In another embodiment, the nozzle member is located at a crease line formed in the filter panel. In yet another, a pair of filter panels are connected at their edges with the nozzle member located along a selected edge as desired. The filter leaf apparatus are installed onto the manifold along attachment axes extending through the housing opening.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. patent applicationSer. No. 11/265,971, filed Nov. 3, 2005 now U.S. Pat. No. 7,922,905.

BACKGROUND

The present exemplary embodiments relate to filter apparatus includingindustrial filters, replaceable filter leafs for use therewith, andmethods of using same. They find particular application in connectionwith polishing filters and will be described with particular referencethereto. However, it is to be appreciated that the present exemplaryembodiments are also amenable to other like applications.

Filtration is a common operation performed in process plants and inother industries. One of the many design considerations in thefiltration art is the amount of filtration area that can be madeavailable in a given space and cost. On one hand, a large filtrationarea is preferred because a larger filtration area results in higherfiltration rates. Further, large filtration areas reduce or minimize thenumber of cleaning cycles required for a given volume of filteredmaterial. However, on the other hand, additional considerations such asaccessibility and economics motivate designs that are not specificallyoptimized solely for filtration area as a design parameter.

Essentially, basic filtration is accomplished by passing a fluid such asa liquid or gas bearing solids through a porous media, usually a cloth,paper, sieve, or other structure. Solid particles carried by the fluidare separated from the fluid by the filter media as the fluid passestherethrough.

Many factors influence a determination of filter design. One primaryfactor of filter design, however, is the degree to which solids beingfiltered from the fluid can be accumulated onto and, thereafter, removedfrom the media. At one extreme of design consideration, particles areeasily filtered. There, a first filter layer is substantially permeableto the liquid or gas filtrate and permits subsequent layers to befiltered until a substantial cake of deposited particles is formed, attimes up to one half inch thick or more. Cake removal usually leavesbehind a clean filter media which can then be reused many times. Filtersof this type are typically referred to as “process filters” and are usedfor applications where a cake can be built up onto the media andthereafter removed for reuse of the media several times. Examplesinclude filter presses, leaf filters, drum filters, belt filters, anddisc filters. In these cases, maximizing filtration area and providingfor solids removal are major design considerations.

On the other extreme of filter design parameter consideration, thefiltered particles themselves are small, irregularly shaped, ordeformable. They embed themselves into the media and cannot be removed.The used media must therefore be disposed of and replaced with newmedia. Filters of this type are generally referred to as “polishingfilters” and are used with these applications. Polishing filters aredesigned for ease of media replacement and, to that end, typicallyinclude cartridge filters and popular bag filters.

In addition to the above, overall, economics plays a role in filterdesign, construction, and use. Generally, in process filtration, thesolids separated from the filtrate are either a product or a significantby-product of a process around which a business is built. Accordingly,these filters have evolved to large proportions, typically 200 squarefeet filtration area or more and usually include some level ofautomation for separation of the filtered solids from the filterapparatus and for handling and subsequent processing thereafter.Furthermore, other parts of the process are specifically arranged togenerate suitable solids for cake filtration necessary for high volume.Filters of this type are thus an integral component in the process andas would be expected, a substantial capital investment for the business.

In contrast, polishing filters are typically used to remove incidentalor other unwanted solids from a moving liquid or other fluid stream. Themain purpose of polishing filter is to keep the filtrate clean formaintenance purposes, product appearance purposes, or where a highpurity in the moving fluid is necessary. One example of an applicationwhere a polishing filter would be useful is in a closed loop coolingwater system. Typical polishing filters handle a very low volume ofsolids and are usually small i.e. less than 20 square feet of filtrationarea and are inexpensive. Therefore, they are considered to be anancillary part of the overall manufacturing or process system. Usually,therefore, it would be uneconomical to use a solids preparation step anda process filter in a polishing filter application.

A problem arises, however, when a polishing filter is placed in asituation to handle more than a small volume of solids. The typicalsolution is often the installation of several bag or cartridge filtersin parallel. However, this solution increases the cost by addingadditional equipment and manpower.

Although there have been attempts to increase the filtration area in bagand cartridge filters, one fundamental problem remains in that both thehousings and replacement elements for both types of filters aretypically cylindrical in shape. The cylindrical shape provides for asimple design and gives the components additional strength against thepressure of filtration and permits easy replacement of the elements.However, cylindrical filters limit the filtration area for a givenfilter apparatus volume.

According to the above, therefore, there is a need in the art for a leaffilter apparatus useful in applications where heretofore polishingfilters were utilized. The leaf filter apparatus should be physicallyoverall small, inexpensive, yet capable of filtering a substantialvolume of incidental or unwanted solids from a moving fluid.Additionally, the filter leafs are preferably made of a disposablematerial and are easily detachable from the filter apparatus structure.

BRIEF DESCRIPTION

In accordance with one aspect of the present application, a polishingfilter apparatus is provided comprising a housing defining a cavity, amanifold in the housing, and a plurality of replaceable filter leafsselectively movable through an opening in the housing and attachable tothe manifold at a plurality of attachment areas. The housing includes afluid inlet port receiving fluids into the housing cavity and an outletport for expelling the fluids from the housing cavity. Further, a lidmember is provided on the housing adjacent an opening defined in thehousing. The lid member is movable between a closed position sealing theopening and an opened position permitting access into the cavity throughthe opening. The manifold in the housing is coupled to the outlet portand includes a plurality of attachment areas. The manifold is adapted toconduct a fluid flow of filtrate between the outlet port and theplurality of attachment areas. The plurality of replaceable filter leafsare selectively movable through the opening and are attachable with themanifold at the plurality of attachment areas. Preferably, the pluralityof attachment areas include a plurality of connection regions defining aplurality of virtual attachment axes extending through the openingdefined by the housing. The plurality of replaceable filter leafsinclude a plurality of nozzle members slidably connectable with theplurality of connection regions of the plurality of attachment areasalong the plurality of virtual attachment axes.

In accordance with a further aspect of the present invention, areplaceable filter leaf apparatus is provided for use in an associatedfilter system including a housing having a cavity with fluid inlet andoutlet ports for conducting a flow of fluids into an out from thehousing and having a manifold coupled to the outlet port. In a firstembodiment, the replaceable filter leaf includes a filter envelopeconsisting of a single substantially rectangular filter panel defining afirst opening and being bent along a crease line, a nozzle member on thefilter panel and defining a passageway adjacent the opening forconducting fluids therethrough, and a grid member contained within thefilter envelope. In its preferred form, the creased filter envelope is arectangular filter panel including a first pair of opposite first andsecond edges defining respective first and second peripheral regions,and a second pair of opposite third and fourth edges defining respectivethird and fourth peripheral regions. The crease line extends between anddivides the third and fourth edges into respective first and secondportions. The first and second peripheral regions of the first andsecond edges are mutually connected. The first and second portions ofthe third peripheral region of the third edge are mutually connected,and the first and second portions of the fourth peripheral region of thefourth edge are mutually connected. Preferably, the first opening isformed at the crease line but can be located anywhere on the rectangularfilter panel as desired.

In accordance with yet a further embodiment of the present application,a replaceable filter leaf apparatus is provided for use in an associatedleaf filter including a housing having a cavity with fluid inlet andoutlet ports for conducting a flow of fluids into and out from thehousing and having a manifold coupled to the outlet port. The filterleaf of this further embodiment comprises a filter element consisting offirst and second rectangular filter panels directly connectedsubstantially entirely along their respective edges, a nozzle memberdefining a passageway, and a grid member contained between the filterpanel portions. In their preferred form, the first and secondrectangular filter panel portions of the filter element are directlyconnected substantially entirely along their respective edges leaving afirst seam therealong and defining a filter space therebetween. Thenozzle member is fastened to the first and second filter panel portionsadjacent the first seam. The passageway defined by the nozzle member isin fluid communication with the filter space through the gap between therectangular filter panel portions.

In accordance with yet a further embodiment of the present application,a replaceable leaf filter apparatus is provided for use with anassociated filter system including a housing having a cavity with fluidinlet and outlet ports for conducting a flow of fluids into and out fromthe housing and having a manifold coupled to the outlet port. The filterleaf apparatus comprises a filter envelope consisting of a singlesubstantially rectangular filter panel bent along a crease line, anozzle member disposed in a seam between edges of the rectangular filterpanel formed by the crease line, and a grid member contained within thespace between opposed portions of the creased rectangular filter panel.In its preferred form, the filter panel of the filter envelope includesfirst and second opposed edges defining respective first and secondperipheral regions, and a second pair of opposed third and fourth edgesdefining respective third and fourth peripheral regions. The filterpanel is bent along a crease line extending between and dividing thethird and fourth edges into respective first and second portions,wherein the first and second peripheral regions of the first and secondedges are mutually connected along a first seam, the first and secondportions of the third peripheral region of the third edge are mutuallyconnected along a second seam, and the first and second portions of thefourth peripheral region of the fourth edge are mutually connected alonga third seam. The nozzle member is preferably disposed in at least oneof the first, second, and third seams and defines a passageway forconducting fluids therethrough. The grid member is contained within thefilter envelope and is adapted to conduct fluids therethrough.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of a filter leaf apparatus formed inaccordance with the prior art;

FIG. 2 a is an exploded oblique view of a filter leaf apparatus formedin accordance with a first preferred embodiment of the presentapplication;

FIG. 2 b is an assembled oblique view of the replaceable filter leafapparatus in accordance with the first preferred embodiment of thepresent application;

FIG. 2 c is an exploded oblique view of a replaceable filter leafapparatus formed in accordance with a second preferred embodiment of thepresent application;

FIG. 2 d is an exploded oblique view of a replaceable filter leafapparatus found in accordance with a third preferred embodiment of thepresent application;

FIGS. 3 a, 3 b, and 3 c are side, end and enlarged views of a filtersystem using replaceable filter leafs in accordance with a fourthpreferred embodiment of the present application;

FIG. 4 a is an elevational view of an embodiment of a replaceable filterleaf apparatus supported on a header assembly using a first adapterarrangement;

FIG. 4 b is a cross-sectional view taken along line 4 b-4 b of FIG. 4 a;

FIG. 5 a is an elevational view of an embodiment of a replaceable filterleaf apparatus supported on a branch pipe manifold using a secondadapter arrangement;

FIG. 5 b is a cross-sectional view taken along line 5 b-5 b of FIG. 5 a;

FIGS. 6 a-6 c are isometric views showing alternative forms of a gridmember used in the subject replaceable filter leaf apparatus of thepresent application;

FIGS. 7 a and 7 b are side and top views in partial cross sectionshowing locking mechanisms for securing the replaceable filter leafapparatus of the application with a manifold in a polishing filtersystem;

FIG. 8 is a partial cross-sectional view of a first adapter assembly forconnecting a replaceable filter leaf with a manifold in accordance withthe present application;

FIG. 9 is a partial cross-sectional view of a second adapter assembly inaccordance with the present application;

FIG. 10 is a cross-sectional view of a third adapter assembly inaccordance with the present application;

FIG. 11 is a partial cross-sectional view of a fourth adapter assemblyin accordance with the present application;

FIG. 12 is a cross-sectional view of a fifth adapter assembly inaccordance with the present application;

FIG. 13 is a partial cross-sectional view of a sixth adapter assembly inaccordance with the present application;

FIG. 14 is a partial cross-sectional view of a seventh adapter assemblyin accordance with the present application;

FIGS. 15 a-15 c are partial cross-sectional views of an eighth adapterassembly in accordance with the present application;

FIGS. 16 a-16 c are partial cross-sectional views of a ninth adapterassembly in accordance with the present application;

FIGS. 17 a-17 c are partial cross-sectional views of a tenth adapterassembly in accordance with the present application;

FIGS. 18 a, 18 b are partial cross-sectional views of an eleventhadapter assembly in accordance with the present application;

FIGS. 19 a, 19 b are partial cross-sectional views of a twelfth adapterassembly in accordance with the present application;

FIGS. 20 a, 20 b are partial cross-sectional views of a thirteenthadapter assembly in accordance with the present application; and,

FIGS. 21 a, 21 b are partial cross-sectional views of a fourteenthadapter assembly in accordance with the present application.

DETAILED DESCRIPTION OF EMBODIMENTS

With reference now to the figures wherein the showings are for purposesof illustrating the invention only and not for purposes of limitingsame, FIG. 1, shows a cross-sectional view of a prior art replaceablefilter leaf device 1 formed in accordance with the prior art. As shownthere, the filter leaf 1 includes a rigid rectangular open frame 2 inwhich is disposed a screen 3. The rigid frame 2 has channels formedtherein and also has portions 4 overlying opposite sides of the screen 3along the edges of the screen. The upper edge of the frame 2 includesoutwardly diverging or inclined flanges 5 which cooperate with aninherently resilient split tubular member or header 6 which serves bothas a discharge member for the filter element 1 and for clamping thecorded edge 7 of a filter bag 8 on the frame 2.

In assembling the part of the filter leaf 1, the filter frame 2 isinitially separated from the split tubular member 6 and the cloth bag 8is drawn upwardly and snugly over the frame with the beaded edges at themouth of the bag underlying the flanges 5 at opposite sides of theframe. Thereupon, the assembled bag and frame are slid into one end ofthe split tubular element 6 with the free edges of the tubular elementdisposed beneath the beads 7 on the bag as shown in the figure. Theinherent resiliency of the header member 6 firmly holds the bag on theframe and the beads 7 on the bag are held in contact with the walls ofthe header member 6 which incline upwardly and outwardly from the edgesof a longitudinal slot formed in the header member 6.

One disadvantage to the prior art filter leaf 1 illustrated in FIG. 1 isthat the outer filter bag 8 is utilized in both a filter capacity aswell as in a sealing capacity. More particularly, the filter bag 8 isheld in contact with the outer edges of the header member 6 which, asdescribed above, is resiliently biased to capture the filter leaf 1 in alongitudinal groove formed therein. It is considered that the use of thefilter bag as an interface at the connection surfaces is disadvantageousbecause the filter bag provides a poor seal and, further, causes unduefriction between the filer leaf and header portion making it difficultto remove the filter leaf for replacement.

With reference to FIG. 2 a, a replaceable filter leaf apparatus 10formed in accordance with an embodiment of the present application isshown in exploded view. In application, the subject filter leaf is usedwith an associated filter system (not shown) including a housing havinga cavity with fluid inlet and outlet ports for conducting a flow offluids into and out from the housing. The typical associated filtersystem includes a manifold coupled to the outlet port and the leaffilter apparatus is adapted for coupling with the manifold.

As shown in the figure, the subject filter leaf apparatus 10 includes afilter envelope 12, a nozzle member 14, and a grid member 16. The filterenvelope 12 consists of a single substantially rectangular filter panel20 provided for surrounding and containing the grid member 16 therein.In the first preferred embodiment of the subject application, the filterpanel 20 is bent along a crease line 22 which intersects a first opening24 defined by the filter panel 20.

As noted above, in its preferred form, the filter panel has asubstantially rectangular conformation and includes a first pair ofopposite first and second edges 30, 32 defining respective first andsecond peripheral regions 34, 36, respectively. A second pair ofopposite third and fourth edges 40, 42 defines respective third andfourth peripheral regions 44, 46, respectively.

In the first preferred embodiment illustrated in FIGS. 2 a and 2 b, thefilter panel 20 is folded along the crease line 22 in a manner to dividethe third and fourth edges 40, 42 into respective first and secondportions 50, 52, and 51, 53, respectively.

It is to be appreciated that the filter panel 20 forming the filterenvelope 12 is folded along the crease line 22 to surround and enclosethe grid member 16 into a final conformation as illustrated in FIG. 2 b.Preferably, in order to maintain a proper seal, the edges of the filterpanel 20 are sealed using suitable fastening means. More particularly,the first and second peripheral regions 34, 36 of the first and secondedges 30, 32 are mutually connected. Further, the first and secondportions 50, 52 of the third peripheral region 44 are mutuallyconnected. Lastly, the first and second portions 51, 53 of the fourthperipheral region 46 are mutually connected.

Many techniques may be used for sealing the edge regions of therectangular filter panel using processes and methods now known orhereinafter developed. Preferably, however, the first and secondperipheral regions 34, 36 of the first and second edges 30, 32 aremutually stitch connected. Similarly, a stitch connection is used toconnect and thereby seal the first and second portions 50, 52 of thethird peripheral region 44 and, likewise, to seal the first and secondportions 51, 53 of the fourth peripheral region 46. As noted, however,other techniques may be used including but not limited to connecting therespective edges and regions using a glue bond or by ultrasonic welding,or the like. Preferably, the nozzle member 14 is stitch connected to thefilter panel 20 although other techniques can be used as well such as bygluing or otherwise bonding the nozzle with the panel.

In the first preferred embodiment illustrated in FIGS. 2 a and 2 b, thefirst opening 24 defined by the rectangular filter panel 20 ispositioned at the crease line 22. However, alternative embodiments arecontemplated within the scope of the present application including theconstructions illustrated in FIGS. 2 c and 2 d. As shown there, thenozzle member 114, 115 in each of the alternative preferred embodimentsis disposed along a seam or gap at the selected one or more edges of thefilter panel elements. Many other nozzle locations are possible as well.Each of the preferred embodiments of the subject leaf filter includes,optionally a support member 13 (FIG. 2 b) extending from the filterpanel at a position spaced from the nozzle member 14 for supporting thefilter envelope relative to an associated structure.

FIG. 2 c shows a filter leaf apparatus 110 formed in accordance with asecond preferred embodiment of the invention in exploded view. As shownthere, the filter leaf apparatus 110 includes a filter envelope 112folded along a crease line 122 to form, when folded over, an upwardlyoriented pocket adapted to receive a grid member 116 therein. A nozzlemember 114 is provided for conducting a flow of fluids from the leaffilter apparatus 110 to an associated filter system (not shown) having asuitable manifold adapted to receive the nozzle member 114. The filterenvelope 112 consists of a single substantially rectangular filter panel120 including a first pair of opposite first and second edges 130, 132defining respective first and second peripheral regions 134, 136, and asecond pair of opposite third and fourth edges 140, 142 definingrespective third and fourth peripheral regions 144, 146, respectively.The filter panel is bent along a crease line 122 as noted above whichextends between and divides each of the third and fourth edges 140, 142into respective first and second portions 150, 152 and 151, 153.

The second preferred embodiment filter leaf apparatus 110 is sealed atits edges in an assembled condition to form a leaf filter having a sizeand shape similar to the embodiment shown in FIG. 2 d. Using FIG. 2 d toillustrate the relative arrangement of parts in the assembled conditionof the second preferred embodiment, the first and second peripheralregions 134, 136 of the first and second edges 130, 132 are mutuallyconnected along a first seam 160. Similarly, the first and secondportions 150, 152 of the third peripheral region 144 of the third edge140 are mutually connected along a second seam 162. Lastly, the firstand second portions 151, 153 of the fourth peripheral region 146 of thefourth edge 142 are mutually connected along a third seam 164. In thatway, the folded over filter panel 120 forms a sealed pocket adapted toreceive the grid member 116 therein.

In its preferred form, the grid member 116 is disposed in the spacingbetween opposite halves of the filter panel to provide a mechanicalspacing therebetween and, further, to provide a plurality of fluidchannels for conducting fluid between opposite portions of the filterpanel.

Still further in connection with the second preferred embodiment, asnoted above, the peripheral regions of the filter panel 120 can besealed using any means presently available or hereinafter developedincluding, without limitation, by mutually stitch-connecting the edges.Further, the present application contemplates connecting the edges bymeans of a glue bond, an ultrasonic weld interface, or any similar orequivalent techniques. After the edges of the filter panel are sealed,the fluid opening defined by the nozzle member 114 conducts a flow offluids through the filter panel. The nozzle member 114 is stitchconnected, glued or otherwise bonded or welded to the filter panel.

With reference next to FIGS. 2 d and 2 b, a third preferred embodimentof the subject replaceable leaf filter apparatus 210 is shown in bothexploded (FIG. 2 d) and assembled (FIG. 2 b) conformations. Again, FIG.2 b is used to illustrate the relative arrangement of parts in theassembled condition of the third preferred embodiment. With particularreference to FIG. 2 d, the subject filter leaf apparatus 210 includes afilter element 211 which includes first and second rectangular filterpanel portions 212 and 213. A nozzle member 214 is provided in thesubject leaf filter apparatus 210 together with a grid member 216 asshown. The first and second rectangular filter panel portions 212, 213of the filter element 211 are connected substantially entirely alongtheir respective edges at a first continuous seam 224 therealong anddefining a filter space therebetween. The nozzle member is affixed orfastened to the first and second filter panel portions 212, 213 adjacentthe first seam 224 as shown best in FIG. 2 b. The nozzle member, in itspreferred form, defines a passageway 215 in fluid communication with thefilter space defined between the filter panel portions 212, 213.

In its preferred form, the nozzle member 214 extends through the firstseam 224 defined between the first and second filter panel portions 212,213. The grid member 216 is adapted to provide a mechanical spacingbetween the first and second panel portions as well as providing a fluidchannel for conducting fluid between the panel portions.

It is to be appreciated that the filter panel portions are mutuallyconnected at their respective edges by any known means including, butnot limited to, a stitch connection, by means of a glue bond, ultrasonicwelding, or by any other methods or techniques. Also, the nozzle member214 is connected with the filter panel portions 212 and 213 by a stitchconnection, glue bonding, welding or any other known methods.

FIGS. 3 a-3 c show a polishing filter apparatus 400 in accordance with afurther preferred embodiment of the present application. As shown there,the polishing filter apparatus 400 comprises a housing 402 defining acavity 404 therein, a manifold 406 disposed within the cavity 404 of thehousing 402, and a plurality of replaceable filter leafs 408 selectivelyattachable with the manifold 406. In its preferred form as illustrated,the housing 402 includes a fluid inlet port 410 adapted to receivefluids into the housing cavity 404, a fluid outlet port 412 forexpelling the fluids out from the housing cavity 404, and a lid member414 hingedly connected to the housing 404 and disposed adjacent anopening 416. The lid member 414 is movable between a closed position(not shown) sealing the opening 416 and an opened position (FIG. 3 a)permitting access into the cavity through the opening 416.

The manifold 406 is operatively coupled with the outlet port 412 andincludes a plurality of attachment areas 420 therealong adapted tocouple with nozzle members on associated filter leaf apparatus of thetype described above. The manifold 406 is adapted to conduct a fluidflow between the outlet port 412 and the plurality of attachment areas420. A plurality of replaceable filter leafs 10 are selectively movablethrough the opening 416 and attachable with the manifold 406 at saidplurality of attachment areas 420.

With continued reference to FIGS. 3 a-3 c, the polishing filterapparatus 400 includes a plurality of connection regions 440 at theattachment areas 420, wherein each of the plurality of connectionregions defines a virtual attachment axis 425 best shown in FIG. 3 a.The attachment axis extends through the opening 416 defined by thehousing 402 in a direction into and out of the page in FIGS. 3 b, 3 cand within the plane of the page in FIG. 3 a. During use of the subjectpolishing filter apparatus, replacement filter leafs are inserted intoand out from the cavity along the plurality of mutually parallel axes425 defined by the plurality of connection regions 440.

Preferably, the plurality of nozzle members 14, 114, 214 on each of theplurality of filter leafs 10 are slidably connectable with the pluralityof connection regions 440 along the plurality of virtual attachment axes425. This enables the leaf to be easily slid into and out of the openingof the housing for an efficient overall polishing filter apparatussystem. The nozzle members of each of the filer leaf embodiments areadapted to slidably interface with manifold of the filter apparatus forease of replacement and maintenance. To that end, FIG. 4 b is a partialcross-sectional view of an interface 500 formed between a nozzle member14 and an associated connection region 440 of a manifold 406 taken alongline 4 b-4 b in FIG. 4 a. In the embodiment illustrated, the nozzlemember 14 is slidably received in a pocket region 430 of the associatedconnection region 440 and a seal is created using suitable gaskets 431such as O-rings or the like carried on the nozzle member 14 or manifold440.

In FIGS. 5 a and 5 b, a slidable interface 510 is illustrated inaccordance with yet a further embodiment of the application. Asillustrated in FIG. 5 a, a filter leaf apparatus 10 is attached with amanifold 406 of a polishing filter apparatus (not shown) using aninterface 510 adapted to slidably receive the filter leaf apparatusrelative to the manifold. FIG. 5 b is a cross-sectional view taken alongline 5 b-5 b of FIG. 5 a. The interface includes a pair of U-shapedfasteners 512 attached to a lower interface portion 513 using suitablebolts or other fasteners. The U-shaped attachment member 512 is adaptedto surround and slidingly receive a hollow tubular portion 405 of themanifold 406 therein. Further, the lower interface portion 513 isadapted to slidingly receive the nozzle member 14 in a pocket region 430thereof. Gaskets 431 such as O-rings carried on the nozzle member sealthe nozzle member with the interface 510. A passageway 15 is defined inthe nozzle member 14 and is in fluid communication with a slot 16defined in the hollow tubular portion 405 for conducting fluid from thepocket defined by the filter envelope 12 using passageways defined bythe grid member 16. In the embodiment illustrated, the manifold 406 issubstantially circular cylindrical although other conformations arecontemplated with the scope of the present application such as, forexample, rectangular cylindrical or any other irregular shape or formcylindrical. Using the arrangement illustrated, the plurality of filterleaf apparatus 10 are slidably received onto the manifold 406 along aninstallation axis 425.

FIGS. 6 a-6 c show alternative preferred embodiments of the grid member16 comprising part of the subject filter leaf apparatus of the subjectapplication. In FIG. 6 a, the grid member 16 comprises a porous stick700 formed of a plurality of stacked plastic rods 702, 704 arranged todefine passageways therebetween. In the embodiment illustrated, only twolayers of stacked plastic rods are illustrated including a first row ofrods 702 and a second row of rods 704 arranged in a transverseorientation relative to the first row 702. However, it is to beappreciated that two or more layers of stacked rod can be used. Further,although the rods are illustrated in a perpendicular stack arrangementbetween adjacent layers, other orientations of rods can be used as wellsuch as oblique and/or obtuse arrangements or orientations between rows.

FIG. 6 b shows grid 16′ including a punched-out gridwork 710 formingchannels therebetween. Preferably, the punch-out gridwork 710 is aplastic construction. However, stainless steel or other corrosionresistant materials can be used as well. The punched out grid 710 isformed in the preferred embodiment illustrated as a series of punched uphalf circles 712 interlaced with a series of punched down half circles714. Each of the half circles 712, 714 define a partial circularpassageway perpendicular to the plane of the grid sheet 716 as well as arectangular opening in the plane of the grid sheet 716.

Lastly, FIG. 7 c shows an egg carton construction 720 for definingpassageways between opposite portions of the filter envelope andassembled into the subject filter leaf apparatus. It is to beappreciated that the grid 11 provides a mechanical spacing betweenopposed portions of the filter panel. As well, the grid member providesa fluid channel for conducting fluid between the opposed portions of thefilter panel.

Turning now to FIGS. 7 a and 7 b, further embodiments of a latchingmechanism 810, 812 are illustrated. In FIG. 7 a, the latching mechanism810 includes a resilient tab member 820 which is biased into engagementwith an overhead manifold portion 406 having a groove 821 definedtherein adapted to receive a suitable seal member 822 such as an O-ringfor example. FIG. 7 b shows a latch mechanism 812 comprising a fork area830 having opposed resiliently biased fork portions 832, 834 which, inthe position illustrated, are relaxed and biased to engage opposed walls407, 409 of the manifold 406. In operation, the opposed fork portions832, 834 are squeezed together against their bias for sliding into theopposed walls 407, 409 of the manifold 406. Thereby, the nozzle 14 islatched into and received into the manifold 406.

FIG. 8 shows yet a further latch mechanism 1000 for selectively couplingin an interlocking fashion a nozzle member 14 with an associatedattachment area 1002 of a manifold (not shown) contained within ahousing cavity of an associated polishing filter apparatus. In theembodiment illustrated, the nozzle member 14 includes an upper enlargedregion 1004 and a lower narrow region 1006. The upper enlarged regiontogether with the lower narrow region collectively form a substantiallyT-shaped nozzle as viewed in cross section. Further, preferably, theupper enlarged region 1004 includes a lower tapered surface 1008 whichprovides a narrow front region 1010 on a lead end 1012 of the nozzlemember 14 and a thick rear region 1014 on a trailing end 1016 of thenozzle member 14.

In addition to the above, the trailing end 1016 of the nozzle member 14carries a resilient latching tab 1020 with a downwardly extending hookportion 1022 and an upwardly extending latch tab 1024.

It is to be appreciated that the latch mechanism 1000 is adapted forinsertion into a similarly shaped attachment area 1002 of an associatedfilter manifold. To that end, the attachment area 1002 includes a narrowdistal receiving end 1030 and a widened proximal receiving area 1032adapted to closely receive the lead end 1012 and the trailing end 1016of the nozzle member 14, respectively. A suitable sealing member 1034,preferably in the form of an O-ring is received in a groove 1036 definedin the attachment area 1002 of the associated manifold. In that way, afluid seal is established between the attachment area 1002 and thenozzle member 14 of the subject latch mechanism 1000 when the nozzle isinserted into the attachment area.

In order to ensure that the nozzle member is suitably held in place, atapered latch groove 1040 is provided on the underside of the attachmentarea 1002. The latch groove is adapted to receive the latching tab 1020when the nozzle member is inserted into the attachment area 1002.

Turning next to FIG. 9, yet a further latch mechanism 2000 isillustrated including a nozzle member 14 and an attachment area 2002 ofan associated manifold in a polishing filter apparatus (not shown). Inthe embodiment illustrated, the nozzle member 14 is inserted along aninsertion axis 425 into the attachment area 2002. An enlarged region2004 is formed on an upper end of the nozzle member 14 and a narrowregion 2006 is provided on the lower portion of the nozzle member 14.Overall, the enlarged region 2004 and the narrow region 2006 form anoverall “T” shaped nozzle member 14.

The upper enlarged region 2004 of the nozzle member 14 includes a lowerraised surface 2008 which is provided on the nozzle member surroundingthe passageway 15 thereof. In the embodiment illustrated, the lowerraised surface 2008 has a semi-circular conformation. However, asunderstood by those skilled in the art, any other surface can be used.

With continued reference to FIG. 9, the attachment area 2002 of theassociated manifold defines a suitable opening 2018 adapted to closelyreceive the upper and lower regions 2004, 2006 of the nozzle member 14.A sealing member 2034 is carried in a groove 2036 formed in theunderside of the attachment area 2002. In addition, the attachment area2002 includes a lower curved tapered surface 2030 adapted to receive thelower raised surface 2008 on a lead end 2012 of the nozzle member 14.Similarly, a curved tapered surface 2032 is provided in the attachmentarea for receiving the lower raised surface 2008 on the trailing end2016 of the nozzle member 14. Essentially, the nozzle member 14 is“snap-fitted” into the attachment area 2002 by the interaction of thelower raised surface 2008 received in the curved receiving areas 2030,2023.

Turning next to FIG. 10, yet a further latch mechanism embodiment 3000is illustrated. As shown there, the latch mechanism 3000 includes anattachment area 3002 adapted to receive a substantially T-shaped nozzlemember 14. In the embodiment illustrated, the nozzle member 14 isinserted into the polishing filter apparatus along a substantiallyL-shaped path 426 having a substantial portion thereof being in parallelwith the preferred axes 425 discussed above in detail. However, in theembodiment illustrated, the latch mechanism 3000 enables the filter leaf(not shown) carried on the nozzle member 14 to be inserted in an upwarddirection as viewed in the figure.

The nozzle member 14 includes an enlarged upper region 3004 and a narrowlower region 3006. In addition, the passageway 15 defined in the nozzlemember 14 includes an upper enlarged circular area 3018 adapted toreceive a corresponding barb portion 3019 defined on a lower leg 3020defined on the lower surface of the attachment area 3002. The lower leg3020 essentially circumscribes the passageway 16 formed in theattachment area 3002 and, when received into the corresponding region3018 of the nozzle 14, forms a fluid seal therebetween. It is to beappreciated that in the embodiment illustrated in FIG. 10, an uppersurface 3030 of the nozzle 14 is mechanically seated against the lowersurface 3032 of the attachment area 3002 to provide a sound mechanicaland fluid interconnection therebetween.

Turning next to FIG. 11, yet another further latch mechanism 4000 isillustrated in connection with the present application. As shown there,the latch mechanism 4000 includes an attachment area 4002 adapted toreceive a suitable configured nozzle member 14 of a filter leaf formedin accordance with the present application. The nozzle 14 includes anenlarged region 4004 and a narrow region 4006. The enlarged region 4004is essentially a ring-shaped area having an upper surface 4030 adaptedto engage an underside or lower surface 4032 of the attachment area4002. In addition, an upper leg 4020 is formed on an upper side of thenozzle 14 and carries an outwardly extending barb portion 4019 forproviding a sound connection between the nozzle 14 and the associatedattachment area 4002. To that end, the attachment area includes abarb-shaped recess or groove 4034 defined in the passageway 16 thereof.In use, the nozzle member 14 is moved along a substantially L-shapedpath 426 which, as illustrated, is substantially along the preferredinsertion axis 425 described above in detail. However, the filter leafcarried on the nozzle 14 is ultimately installed onto the attachmentarea 4002 of the manifold in an upward direction as viewed in thefigure.

Turning next to FIG. 12, yet still another further latch mechanism 5000is illustrated. As shown, an attachment area 5002 is adapted to receivea similarly shaped nozzle 14 along an insertion pathway 426 which, asnoted above, is substantially L-shaped and includes a major portionalong the preferred insertion axis 425 described above. However, thenozzle 14 is inserted ultimately in an upward direction as shown in thedrawing figure.

The nozzle 14 includes an upper enlarged region 5004 and a lower narrowregion 5006. This gives the nozzle member 14 an overall T-shapedconfiguration. In addition to the above, the nozzle member 14 includes agroove 5010 adapted to receive a similarly shaped lower leg 5012 carriedon the underside of the attachment area 5002. The leg 5012 carries abarb 5019 for connection with a similarly shaped connecting surface 5020of the nozzle 14.

It is to be appreciated that in the embodiment illustrated in FIG. 12,the lower leg 5012 is spaced away from the passageway 16 extendingthrough the attachment area 5002 to form a substantially annular contactsurface 5030 adapted to contact with an engage for a fluid typeconnection with an upper surface 5032 of the nozzle member 14. This isuseful when the negative pressure within the subject filter apparatus issignificant. In that way, the surface 5030 prevents or otherwisediscourages portions of the nozzle member 14 from being drawn into thepassageway 16 owing to a substantial negative pressure.

Turning next to FIG. 13, yet a still further latch mechanism 6000 isillustrated. With reference now to that figure, an attachment area 6002includes a continuous groove 6004 defined on an underside 6006 thereof.The continuous groove 6004 is adapted to receive a correspondinglyshaped upper leg 6010 formed at an upper narrow region 6008 of thenozzle member 14. A barb 6011 is carried on the leg 6010 and is adaptedto be received in a suitably shaped barb region 6013 defined in thegroove 6004. In that way, the barb carried on the nozzle member, whenreceived in the corresponding groove, effectively latches the nozzlemember 14 to the attachment area 6002.

It is to be appreciated in FIG. 13 that the underside 6006 of theattachment area 6002 includes a continuous contact area 6030 defined inthe gap between the groove 6004 and the passageway 16. The contactsurface 6030 forms an effective mechanical and fluid seal between theunderside 6006 of the attachment area 6002 and an upper surface 6038 ofthe nozzle member 14. In that way, portions of the nozzle member 14 areprevented from being drawn into the passageway 16 when the subjectfilter is operated under extreme negative pressures.

Turning next to FIG. 14, yet a further latch mechanism 7000 isillustrated and includes an attachment area 7002 adapted to receive asuitably shaped nozzle member 14 therein. As illustrated, the nozzlemember 14 is inserted into an opening 7018 formed at the attachment area7002 along an insertion axis 425. The nozzle member 14 includes an upperenlarged region 7004 and a lower narrow region 7006. The upper enlargedregion together with the lower narrow region forms a substantiallyT-shaped nozzle member as viewed in cross section. The lead end 7012 ofthe nozzle member 14 includes a narrow front region 7010 and, similarly,the trailing end 7016 includes a narrow rear region 7014. It is to beappreciated that in the embodiment illustrated in FIG. 14, the thicknessof the front and rear regions 7010, 7014 on the lead and trailing ends7012, 7016, are similarly sized. To that end, the latch mechanism 7000illustrated is essentially a friction fit scheme.

A sealing member 7034 is carried in a groove 7036 defined on theunderside of the attachment area 7002. During use, the sealing member7034 mechanically engages an upper surface 7036 of the nozzle 14 toestablish a fluid seal therebetween.

FIGS. 15 a-15 c show yet still a further latch mechanism 8000 formed inaccordance with the present application. As shown there, an attachmentarea 8002 includes an outwardly projecting lip member 8004 adapted to bereceived in a correspondingly shaped grooved area 8006 defined betweenupper and lower extension members 8010, 8012 formed on opposite sides ofa passageway 15 defined by the nozzle member 14. In that way, the nozzlemember 14 is received onto the attachment area 8002 by insertion thereofalong the preferred insertion axis 425. Essentially, in the embodimentillustrated, the upper and lower portions 8010, 8012, capture theoutwardly extending lip portion 8004 therebetween.

Turning next to FIGS. 16 a-16 c, yet still a further latch mechanism9000 is illustrated. As shown there, an attachment area 9002 includes ahollow region 9004 for fluid communication between the attachment area9002 and a correspondingly formed nozzle member 14. The attachment area9002 is substantially C-shaped in cross section as best shown in FIG. 16c. As illustrated there, the passageway 9004 of the attachment area 9002communicates on left and right sides 9010, 9012 of the nozzle member forefficient fluid communication along a pathway P.

As shown in FIG. 16 b, a tab member 9020 is carried on the trailing end9016 of the nozzle member 14. A barb 9018 is formed on the tab 9016 forselective latching receipt into a corresponding groove latch 9020 formedin the attachment area 9002. In this way, the nozzle member 14 can besecurely latched into the attachment area 9002.

Turning next to FIGS. 17 a-17 c, still yet a further latch mechanism10000 is illustrated for connecting a filter leaf 10 to an associatedmanifold 406 along an insertion axis 427. In the embodiment illustrated,the nozzle member 14′ includes an elongated contact portion 10100 stitchconnected or otherwise connected to a filter panel portion of the filterleaf 10. As shown, the contact portion 10100 includes a U-shapedreceiving area 10102 forming an inwardly-shaped receiving area 10104best shown in FIG. 17 c for receiving an outwardly projecting lipportion 10106 of the manifold 406. In the embodiment illustrated, thefilter leaf 10 is inserted along the insertion axis 427 for a connectionbetween the manifold and the filter leaf at a side of the filter leaf.

Turning next to FIGS. 18 a and 18 b, yet still a further latch mechanism11000 is illustrated. As shown there, a filter leaf 10 is adapted forsliding receipt onto an elongate manifold 406. As shown in cross sectionin FIG. 18 b, the manifold 406 defines an elongate slit 16 in fluidcommunication with a passageway 15 defined in the nozzle member 14. Inthe embodiment illustrated, the nozzle member 14 includes an outercircular member 11002 adapted to slidingly receive over the circularcylindrical manifold portion 4006. This is best illustrated in FIG. 18b. Essentially, in the embodiment illustrated, the filter leaf 10carrying the nozzle member 14 is slid onto the elongated manifold 406.

FIGS. 19 a and 19 b illustrate a still further embodiment of a latchmechanism 12000 formed in accordance with yet a further embodiment ofthe invention. As shown there, the manifold 406 is an essentiallyelongated tubular structure adapted to receive on a first end 12002 thenozzle member 14 of the leaf filter 10. In the figure, the leaf filter10 is carried on the manifold 406 so that fluid communication isestablished only between the end of the manifold 406 and a correspondingpassageway 15 formed in the nozzle member 14.

FIGS. 20 a and 20 b show yet still a further latch mechanism embodiment13000 formed in accordance with the present application. In thatembodiment, the nozzle member 14 is essentially an elongated tubularmember 13002 adapted for snap fitting onto an end 13004 of the manifold406.

Lastly, FIGS. 21 a and 21 b show yet still further another andadditional latch mechanism 14000 including a nozzle member 14 adaptedfor sliding connection onto a manifold 406 in an upward direction asviewed in the figure. As shown in cross section in FIG. 21 b, the nozzlemember 14 includes a circular portion 14002 adapted to surroundinglyreceive the tubular manifold 406 therein.

The exemplary embodiment has been described with reference to thepreferred embodiments. Obviously, modifications and alterations willoccur to others upon reading and understanding the preceding detaileddescription. It is intended that the exemplary embodiment be construedas including all such modifications and alterations insofar as they comewithin the scope of the appended claims or the equivalents thereof.

1. A replaceable filter leaf apparatus for use in an associated filtersystem including a housing having a cavity with fluid inlet and outletports for conducting a flow of fluids into and out from the housing andhaving a manifold operatively coupled with the outlet port, the filterleaf apparatus comprising: a drainage grid member defining a plane andcomprising at least one channel for directing a fluid to flow in one ormore directions substantially parallel with the plane defined by thedrainage grid member; a porous filter media disposed adjacent thedrainage grid member for filtering the fluid entering the grid member;and, a nozzle adapter member operatively coupled with the drainage gridmember and the porous filter media, the nozzle adapter member definingan elongate passageway for conducting fluids therethrough along a firstdirection within the nozzle adapter member, the nozzle adapter memberadapting the filter leaf apparatus for selective slidable connectionwith the manifold of the associated filter system in a second directionsubstantially perpendicular to the first direction, wherein a sealingportion of the nozzle adapter member is configured to generate a seal ina sealing plane between a margin surface surrounding an outlet of theelongate passageway of the nozzle adapter member and the associatedmanifold by biasing the nozzle adapter member against the associatedmanifold along an axis substantially perpendicular to the sealing plane.2. The replaceable filter leaf apparatus according to claim 1 whereinsaid grid member is adapted to provide i) a mechanical spacing betweenopposed portions of said filter media, and ii) a fluid channel forconducting fluid between said opposed portions of the filter media. 3.The replaceable filter leaf apparatus according to claim 1 furtherincluding: a support member extending from said filter media at aposition spaced from said nozzle member for supporting said filterenvelope relative to an associated structure.
 4. The replaceable filterleaf apparatus according to claim 1 wherein said nozzle member isT-shaped.
 5. A polishing filter apparatus comprising: a housing defininga cavity and having: i) a fluid inlet port receiving fluids into thehousing cavity, ii) an outlet port for expelling said fluids out fromthe housing cavity, and iii) a lid member on said housing adjacent anopening defined in the housing and movable between a closed positionsealing said opening and an opened position permitting access into saidcavity through said opening; a manifold coupled with said outlet portand having a plurality of attachment areas, the manifold being adaptedto conduct a fluid flow between said outlet port and said plurality ofattachment areas, the plurality of attachment areas including aplurality of connection regions defining a plurality of virtualattachment axes, the manifold being connected relative to the housing ata position wherein the plurality of virtual attachment axes extendthrough said opening defined by the housing; and, a plurality ofreplaceable filter media leafs selectively movable through said openingand slidably attachable with said manifold in first directions parallelto the plurality of virtual attachment axes at said plurality ofattachment areas, each of the plurality of replaceable filter medialeafs including a filter envelope and a nozzle adapter member connectedwith the filter media leaf, the nozzle adapter member being slidablyconnectable with a one of the plurality of connection regions of theplurality of attachment areas in the first direction parallel to thevirtual attachment axis and defining an elongate passage for conductingsaid fluids therethrough in a second direction perpendicular to thefirst direction, the nozzle adapter member adapting the replaceablefilter media leaf for selective connection with the manifold andincluding a sealing portion biasing the nozzle adapter member againstthe manifold in a bias direction forming a seal between the nozzleadapter member and the manifold in a substantially planar sealing planeperpendicular to the bias direction.
 6. The polishing filter apparatusaccording to claim 5 wherein: said plurality of virtual attachment axesare mutually parallel; and, said plurality of replaceable filter medialeafs are slidably attachable with said plurality of connection regionsalong said plurality of parallel virtual attachment axes.
 7. Areplaceable filter leaf apparatus for use in an associated filter systemincluding a housing having a cavity with fluid inlet and outlet portsfor conducting a flow of fluids into and out from the housing and havinga manifold coupled to the outlet port, the filter leaf apparatuscomprising: a filter envelope consisting of a porous filter media; and,a nozzle adapter member in operative fluid communication with the filtermedia and defining an elongate passageway for conducting fluids in afirst direction therethrough, the nozzle adapter member adapting thefilter leaf apparatus for selective connection with a manifold of anassociated filter system and being formed of a substantially resilientmaterial and including a connection portion adapted for slidableconnection with the manifold of the associated filter system along avirtual attachment axis in a second direction perpendicular to saidfirst direction, the nozzle adapter member including a sealing portionbiasing the nozzle adapter member against the manifold along a biasingaxis to generate a seal between the nozzle adapter member and themanifold in a substantially planar sealing plane perpendicular to thebiasing axis.
 8. The replaceable filter leaf apparatus according toclaim 7 wherein said nozzle member extends through a first openingdefined by said filter media.
 9. The replaceable filter leaf apparatusaccording to claim 7 further comprising: a grid member adapted toprovide i) a mechanical spacing between opposed portions of said filtermedia, and ii) a fluid channel for conducting fluid between said opposedportions of the filter media.
 10. The replaceable filter leaf apparatusaccording to claim 7 further including: a support member extending fromsaid filter media at a position spaced from said nozzle member forsupporting said filter envelope relative to an associated structure. 11.The replaceable filter leaf apparatus according to claim 7 wherein saidconnection portion is adapted for said slidable connection with themanifold of the associated leaf filter along the virtual attachment axisto enable the filter leaf apparatus to be easily slid onto and off fromthe manifold of the associated filter system by movement of said filterleaf apparatus relative to said filter system along said virtualattachment axis in said second direction.
 12. The replaceable filterleaf apparatus according to claim 11 wherein the manifold of theassociated filter system defines a pocket region and said nozzle memberis T-shaped for slidable receipt in the pocket region.
 13. Thereplaceable filter leaf apparatus according to claim 12 furtherincluding a gasket carried on the nozzle member for creating a sealbetween the nozzle member and the manifold of the associated filtersystem.
 14. The replaceable filter leaf apparatus according to claim 11wherein said nozzle member defines a latch configured to selectivelycouple the filter leaf with the manifold of the associated filtersystem.
 15. The replaceable filter leaf apparatus according to claim 14wherein said latch includes a resilient tab member biased intoengagement with a groove defined by the manifold of the associatedfilter system.
 16. The replaceable filter leaf apparatus according toclaim 14 wherein said latch includes opposed resiliently biased forkportions configured to engage opposed walls of the manifold of theassociated filter system.
 17. The replaceable filter leaf apparatusaccording to claim 7 wherein the connection portion of said nozzleadaptor member is formed of a plastic material.
 18. The replaceablefilter leaf apparatus according to claim 17 wherein the connectionportion is tapered in said second direction.